Variable-speed changing device



Dec. 20, SVENSSON VARIABLE SPEED CHANGING DEVICE 3 Sheets-Sheet 1 Filed Sept. 6, 1944 FIELI- Fig-3..

FIE-E- HENRYSVENEEUN Dec. 1949 SVENSSQN 2,492,071

VARIABLE SPEED CHANGING DEVICE Filed Sept. 6, 1944 3 Sheets-Sheet 2 INVENTOR.

HENRY EVENSEUN D ceased i wdnnwm- 1949 H. SVENSSON 2,492,071

VARIABLE SPEED CHANGING DEVICE Filed Sept. 6, 1944 3 Sheets-Sheet 3 11v VEN TOR. HENR'YE'VE/VSSUN BY a Eff-g am. Wu W; ldmmmk #7 T TOR/WW" Patented Dec. 20, 1949 mire-o PATENT VARIABLE- SPEED CHANGING DEVICE Henry svens on, de d, l t of New York, N. Y., by Agnes B. Sve sson, administratrix, New York, np b .m sne ass n ments, to Agnes B. svens'jso'n, New York,

Application September 6, 1944, Serial No. 552,880

.Claims. 1

This invention relates to a device for the conversion of a constant rotary motion into any desired motion between zero and a given maximum, particularly adapted as a variable speed device, and may also be known as a universal speed changer.

The salient feature in this invention consists of an ri inal s eed chan n li disc, the relative lo e o Whieh w th es to the n shaft is adjustable by means of a special device through which the speed oi rotation of the driven shaft ca b ar ed a d ir d- ,Another feature of this invention is the adaptability of the device for power driven toy and miniature devices in cooperation with a small motor or self propelling power driving means.

Another feature of this invention is the precise adjustment of the variable speed changing mechanism, being automatic in its movement of oscillating motion for the driving means of the over running clutches on the shaft to be driven, the equalizing crank and lever driving mechanism making the speed constant for the drivenshaft.

Other features of this invention will appear as the description proceeds in the following specification, accompanied by the annexed drawings, in

which Figure 1, shows a horizontal section through the speed changer with the reeling disc in a neutral position, taken on line l--.l of Fig. 2.

Figure 2 shows a vertical section through the same speed changer with the reeling disc in the oblique position, taken on line 22 of Fig. 1.

Figure 3 is a vertical section taken along the line 3:3 of Figure 1, showing an example of the motion transmission from the reeling disc to the driven shaft.

Figure 4; is a sectional view taken on line 4-4 of Figure 3.

Figure 5 is a sectional view taken along line 35 5 o re 2- Figure 6 is a fragmentary diagrammatic view showing another example of the transmission of the motion.

Figure 7 is a side elevational view of the speed changin device of the present invention.

Figure 8 is a sectional view taken on line 88 of Figure 9, and shows an equalizing arrangement of the crank and lever mechanism between the reeling disc and the shaft 26,

Figure 9 is a sect nhalview on line 99 of Fi u e 8- his in en ion eoheis o th e s n a be ame the re l ng s A w c comp is se eral part th settin viee B the 9- e transmi ter C- Wi hih a easin t e e is is sed a an ular el n else A hich its p vo is mal .2 mtefiebly mounted hal hea s 3- 'Ihe ree n di A nsist o We sui e the a nular part or ring 4 which can only execute a p he le ihe meiieher uhs i s. i ot Z t wh i is secure a d the inner see i th as a hea n nd s aft w ich rot es i th p n 4 and which is hel ih p fillQIl by fiaheesfi of the ring a in a y the khewh war On ac ou t of tion he r tatin disc 5 is made to rot e on the all bea ng Tend .is su porte by W s se po i ioned shat-t and 1mi a being located wit it; the dehb e a med has 10 which is rotatably positioned two ball bearings hin he c ing h e the ha t 9 pa se h us a bor hole ii: the sha 8 n when Sleeves i 2 eeur o ea h arm o t e shaft In A driving shaft 13 from the motor (not shown) s u ed t one end f th ou e armed haf II while an d ust ng sh t 1.4 teles o s and i slidab a t ched to h sha 10, so at h Sh t s f rced to rotate with he s a t in. but ca at t e am time be s re ed v hwh vd or b ckwa d ax a l thi t e d bl arme shaft in by means of the hand wheel 15,

One or more lever It a a t culated, ene ion with the e d o the adjus in shaft i that is within the shah L0, and th othe e ds of these levers are in articulated connection with the sh ft a a res lt of ich th ree in dis A. ma b set mo e o e s ob ique accordin to how f r th adjustin haft !4 is scr d .ih waril ith n he doub e armed sha t h sett n de i e 1,3 a so onsist o se eral pa ts a d tma b ons uct d as fol ows for ample;

On he adjusting shaf 1 he e are fi mly c ew t o flan es .1 a d 9 whi h ntai beargs 1 1i an 2J- B ween. t e hearin s in an 2' is loc ted uide fl ng 2? that i integral with the the c ind r 2.3; wh ch is p oviqied ith an e erior thr aded poetics, vand hic ee i e cre ed ou hi o into n nieriorl th e d cy i al ext nsion 24 on. th ca in l T e dwhe 51 edly se ured to h i er 3 in the u ual k wn m nne Ba in 20 a d, 2' we be s cur d i ny desi way onto the flanges I8 and I!) that are screwed onto h adiu h Shaf 14- B m ans Q thi a an emen b th he ha 14 and th flanges l8 an 19 with thei bell hearing halves can ittateen t e bel o th hear n w hi t e cylland 28b or the toothed segment 31.

inder 23. This is one description of a setting arrangement, but of course others or other means can be adopted without departing from the scope of this invention, for example, by utilization of a lever.

The object of the motion transmitter C is to transform the to-and-fro motion of the pivots into a rotary motion of a driven shaft 26.

The crank arms are secured on the reeling disc A, designated as 21 and 21b and disposed at 180 from each other (one on each side of the reeling disc A), and these are in connection with connecting rods 28 and 28?) mounted on the shaft 26. These connecting rods are provided with over running clutches which drive the shaft 26 when either connecting rod moves forward, and permit either to move back without interfering with the driving action effected by the other. The over running clutches may employ rollers or balls 29. From Figure 6, it can be seen that instead of connecting rods, use may also be made of toothed segments, the transferring principle being the same as above described. Or, other known friction systems may also be used instead of the above described example.

The described arrangement operates in the following way:

When the reeling disc A is in the position shown in Figure 1 and the driving shaft I3 rotates with a constant motion,.the shafts l0 and I4 rotate simultaneously by means of the shafts 8 and 9, and the levers l6 and I1, and at the same time ,the disc 5 is brought into rotation within the :ring 4. The ring 4 has its center line at a right angle to the axis of the shaft [3, therefore the output shaft 26 will not rotate at all.

When it is desired to obtain power from the device (by causing the shaft 26 to rotate, the

hand wheel I5 is turned to move shaft I4 axially to the right (Figures 1 and 2), causing the reelfrom taking part in the rotation of ring 4. In

. this way the pivots 2 execute a to-and-fro motion which is transferred to the crank arms 27a and 211) or the toothed segment 3|], and this in turn transmits the motion to the connecting rods 28 When the hinge pivot or clutch lever 21 moves in the direction of the arrow, the connecting rod 28 becomes .locked onto the shaft 26 by means of the clutch rollers 29, and sets the shaft 26 in rotation in the direction of the arrow, while the hinge pivot or clutch lever 21!) moves opposite to the direction of the arrow, and this causes the connecting rods 128 to free the shaft 26 of the clutch rollers 29. On the return stroke, the rod 281) locks and causes the shaft 26 to rotate in the same way as before,

-while the rod28 is .in free motion.

According as the'position of the reeling disc is more or less oblique, the rotation of the shaft f 26 can vary from 0 (as shown in Figure 1) up to a given maximum, while the shaft l3 keeps ro- ,tating at the same time with constant speed.

1. Figures 8 and 9 show an alternative form over Figures 3 and 4, respectively, in which the crank 1 arms 21a and 281) are of equal length and form walking beam members 210 and 280, the ends 27d and 28d are each connected by links or levers 21c "and 28e, which connect to pivotal bearings 21g and 28g, slidably arranged in slotted portions 21h and 28h of the hinge pivots or clutch levers 28' and 28b. The to-and-fro or oscillating movements of the reeling disc 4 and operating lever mechanism are shown in dot-dash lines, in which an equalizing movement is maintained so that the shaft 26 may be driven in a constant clutching intermittent motion, or the transmission motion C.

In Figure '7 a side elevational view is shown of this variable speed changer device, the approximate smallest size being shown in full lines,

and the larger size being shown in dot-dash lines, but the device may be still smaller in proportion or larger, if so desired. The main idea is to build such a miniature device adapted for miniature toys or devices using power means for operating, in which variable speed may be accomplished with this present speed changer.

It is to be understood that the drawings and the description thereof, are illustrative of this invention, and reserve any alteration and improvement of any part or in the operation, providing same comes within the spirit of this invention and within the scope of the appended claims.

Having thus described this invention, what is claimed as new and desired to secure by Letters Patent of the United States of America, is as follows:

1. A drive'mechanism comprising a housing, a drive shaft journaled in said housing, an inclined camming disc secured to said drive shaft for rotetion therewith, a substantially cylindrical follower member surrounding said camming disc and rotatable relative'thereto, pivot pinsdiametrically disposed on said follower member and journaled in said housing for oscillation when said follower member is rocked by rotational movements of said camming disc, a driven shaft journaled in said housing, and means associated with said pivot pins for converting oscillatory movement of said pivot pins to rotation of said driven shaft.

2. A drive mechanism comprising a housing, a drive shaft journaled in said housing, an inclined camming disc, a follower member mounted in said housing, pivot pins secured to said follower member and journaled in said housing to permit pivoting of said follower in response to rotation of said camming disc, said pivot pins being oscillated by such movement of said follower member, a driven shaft journaled in said housing, a crank arm secured to said pivot pins,

and an overrunning clutch operatively connected 7 to said driven shaft having an arm member connected at its outer end to the free end of said crank arm for oscillating movement therewith for converting oscillatory movement of said pivot pins to rotation of said driven shaft.

3. A drive mechanism comprising a housing, a drive shaft journaled in said housing, an inclined camming disc, a follower member mounted in said housing, pivot pins secured to said follower member and journaled in said housing to permit pivoting of said follower member in response to rotation of said camming disc, said pivot pins being oscillated by such movement of said follower, a driven shaft journaled in said ..housing, means associated with said pivot pins for converting oscillatory movement of said pivot pins into rotation of said driven shaft and screw means for changing the inclination of said camming disc from zero inclination to a maximum inclination to cause zero to maximum oscillation of said pivot pins.

4. A drive mechanism comprising a housing, a drive shaft journaled in said housing having spaced apart arms extending across said housing, a camming disc rotatable with said drive shaft and inclinable relative to said drive shaft, means for varying the inclination of said camming disc, a substantially cylindrical follower member surrounding said camming disc, pivot pins diametrically disposed on said follower and pivotally journaled on said housing, said follower being oscillated on said pivot pins in response to rotative movements of said inclined camming disc. a driven shaft journaled in said housing, a crank arm connected to one of said pivot pins, and an overrunning clutch connected to said driven shaft having an arm operatively connected to the free end of said crank arm to cause oscillation of said clutch arm to convert oscillatory movement of said pivot pins to rotary movement of said driven shaft.

5. A drive mechanism comprising a housing, a drive shaft journaled in said housing having spaced apart arms extending across said housing and having bearing portions projecting: normal to each arm, a camming disc rotatable with said drive shaft and inclinable relative to said drive shaft, a pivot shaft extending through the bearing portions of said drive shaft and secured at either end in said camming disc permitting relative pivoting of said drive shaft and said disc, a shaft secured diametrically across said camming disc and journaled at the center on said pivot shaft and associated at each end with said camming disc, a screw member associated with said shaft for pivoting said camming disc on said pivot shaft relative to said drive shaft, a follower member surrounding said camming disc, pivot pins diametrically disposed on said follower and pivotally journaled in said housing, said follower being oscillated on said pivot pins in response to rotative movements of said inclined camming disc, a driven shaft journaled in said housing, a crank arm connected to one of said pivot pins, an overrunning clutch operatively connected to said driven shaft having an arm member connected at its outer end to the free end of said crank arm for oscillating movement therewith.

AGNES B. SVENSSON, Administratrza: of the Estate of Henry Svensson,

Deceased.

REFERENCES CITED The following references are of record in the 

